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/*
* drivers/leds/leds-apu.c
* Copyright (C) 2017 Alan Mizrahi, alan at mizrahi dot com dot ve
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the names of the copyright holders nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* Alternatively, this software may be distributed under the terms of the
* GNU General Public License ("GPL") version 2 as published by the Free
* Software Foundation.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <linux/dmi.h>
#include <linux/err.h>
#include <linux/init.h>
#include <linux/io.h>
#include <linux/kernel.h>
#include <linux/leds.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#define APU1_FCH_ACPI_MMIO_BASE 0xFED80000
#define APU1_FCH_GPIO_BASE (APU1_FCH_ACPI_MMIO_BASE + 0x01BD)
#define APU1_LEDON 0x08
#define APU1_LEDOFF 0xC8
#define APU1_NUM_GPIO 3
#define APU1_IOSIZE sizeof(u8)
/* LED access parameters */
struct apu_param {
void __iomem *addr; /* for ioread/iowrite */
};
/* LED private data */
struct apu_led_priv {
struct led_classdev cdev;
struct apu_param param;
};
#define cdev_to_priv(c) container_of(c, struct apu_led_priv, cdev)
/* LED profile */
struct apu_led_profile {
const char *name;
enum led_brightness brightness;
unsigned long offset; /* for devm_ioremap */
};
struct apu_led_pdata {
struct platform_device *pdev;
struct apu_led_priv *pled;
const struct apu_led_profile *profile;
int num_led_instances;
int iosize; /* for devm_ioremap() */
spinlock_t lock;
};
static struct apu_led_pdata *apu_led;
static const struct apu_led_profile apu1_led_profile[] = {
{ "apu:green:1", LED_ON, APU1_FCH_GPIO_BASE + 0 * APU1_IOSIZE },
{ "apu:green:2", LED_OFF, APU1_FCH_GPIO_BASE + 1 * APU1_IOSIZE },
{ "apu:green:3", LED_OFF, APU1_FCH_GPIO_BASE + 2 * APU1_IOSIZE },
};
static const struct dmi_system_id apu_led_dmi_table[] __initconst = {
{
.ident = "apu",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "PC Engines"),
DMI_MATCH(DMI_PRODUCT_NAME, "APU")
}
},
{}
};
MODULE_DEVICE_TABLE(dmi, apu_led_dmi_table);
static void apu1_led_brightness_set(struct led_classdev *led, enum led_brightness value)
{
struct apu_led_priv *pled = cdev_to_priv(led);
spin_lock(&apu_led->lock);
iowrite8(value ? APU1_LEDON : APU1_LEDOFF, pled->param.addr);
spin_unlock(&apu_led->lock);
}
static int apu_led_config(struct device *dev, struct apu_led_pdata *apuld)
{
int i;
int err;
apu_led->pled = devm_kcalloc(dev,
apu_led->num_led_instances, sizeof(struct apu_led_priv),
GFP_KERNEL);
if (!apu_led->pled)
return -ENOMEM;
for (i = 0; i < apu_led->num_led_instances; i++) {
struct apu_led_priv *pled = &apu_led->pled[i];
struct led_classdev *led_cdev = &pled->cdev;
led_cdev->name = apu_led->profile[i].name;
led_cdev->brightness = apu_led->profile[i].brightness;
led_cdev->max_brightness = 1;
led_cdev->flags = LED_CORE_SUSPENDRESUME;
led_cdev->brightness_set = apu1_led_brightness_set;
pled->param.addr = devm_ioremap(dev,
apu_led->profile[i].offset, apu_led->iosize);
if (!pled->param.addr) {
err = -ENOMEM;
goto error;
}
err = led_classdev_register(dev, led_cdev);
if (err)
goto error;
apu1_led_brightness_set(led_cdev, apu_led->profile[i].brightness);
}
return 0;
error:
while (i-- > 0)
led_classdev_unregister(&apu_led->pled[i].cdev);
return err;
}
static int __init apu_led_probe(struct platform_device *pdev)
{
apu_led = devm_kzalloc(&pdev->dev, sizeof(*apu_led), GFP_KERNEL);
if (!apu_led)
return -ENOMEM;
apu_led->pdev = pdev;
apu_led->profile = apu1_led_profile;
apu_led->num_led_instances = ARRAY_SIZE(apu1_led_profile);
apu_led->iosize = APU1_IOSIZE;
spin_lock_init(&apu_led->lock);
return apu_led_config(&pdev->dev, apu_led);
}
static struct platform_driver apu_led_driver = {
.driver = {
.name = KBUILD_MODNAME,
},
};
static int __init apu_led_init(void)
{
struct platform_device *pdev;
int err;
if (!dmi_match(DMI_SYS_VENDOR, "PC Engines")) {
pr_err("No PC Engines board detected\n");
return -ENODEV;
}
if (!(dmi_match(DMI_PRODUCT_NAME, "APU"))) {
pr_err("Unknown PC Engines board: %s\n",
dmi_get_system_info(DMI_PRODUCT_NAME));
return -ENODEV;
}
pdev = platform_device_register_simple(KBUILD_MODNAME, -1, NULL, 0);
if (IS_ERR(pdev)) {
pr_err("Device allocation failed\n");
return PTR_ERR(pdev);
}
err = platform_driver_probe(&apu_led_driver, apu_led_probe);
if (err) {
pr_err("Probe platform driver failed\n");
platform_device_unregister(pdev);
}
return err;
}
static void __exit apu_led_exit(void)
{
int i;
for (i = 0; i < apu_led->num_led_instances; i++)
led_classdev_unregister(&apu_led->pled[i].cdev);
platform_device_unregister(apu_led->pdev);
platform_driver_unregister(&apu_led_driver);
}
module_init(apu_led_init);
module_exit(apu_led_exit);
MODULE_AUTHOR("Alan Mizrahi");
MODULE_DESCRIPTION("PC Engines APU1 front LED driver");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("platform:leds_apu");
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